25CSM04T-I/MF

Overview

The Microchip Technology 25CSM04T-I/MF is a 4-Mbit (524,288 x 8) SPI Serial EEPROM designed for reliable nonvolatile data storage. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 8 MHz at VCC ≥ 3.0V. The device features a dedicated Security Register containing a factory-programmed 128-bit serial number and a 256-byte user-programmable lockable ID page. Built-in Error Correction Code (ECC) logic enhances data integrity by correcting single-bit errors within four-byte read sequences. It offers configurable write protection via Legacy or Enhanced modes and ensures high reliability with over one million erase/write cycles and greater than 100 years of data retention.

Feature Summary

• Integrated Security Register with preprogrammed 128-bit unique serial number and user-lockable ID page
• Built-in ECC logic for automatic correction of single-bit errors during read operations
• Configurable write protection supporting both Legacy block protection and Enhanced partition-based schemes
• JEDEC-compliant Identification Register for electronic device querying and verification

Applications

• Consumer electronics requiring dependable nonvolatile memory
• Industrial applications needing robust data retention and security
• Medical devices utilizing secure serialization and protected storage

Procurement Notes

Verify the specific suffix 'MF' against official Microchip documentation to confirm the exact package type and tape/reel specifications, as datasheets may list SOIC, TDFN, or CSP options. Ensure the industrial temperature grade (-40°C to +85°C) aligns with system requirements. Confirm that the 2.5V to 5.5V operating voltage range matches the target power supply rails before finalizing procurement.

Selection Notes

Select this component when a 4-Mbit capacity with integrated hardware security features is required. The inclusion of a unique serial number simplifies manufacturing line serialization processes. Consider the Enhanced Write Protection mode if complex, partition-specific access control is necessary. Verify that the SPI interface timing parameters meet the host controller's capabilities, particularly regarding the 8 MHz maximum clock frequency at higher voltages.

Part Context

The 25CSM04 belongs to Microchip's CS series of Serial EEPROMs, which are optimized for applications demanding high reliability and security. This series integrates standard EEPROM functionality with advanced features like ECC and hardware-based write protection. The device is part of a broader family offering various capacities and package options, designed to replace legacy memory solutions in modern embedded systems.

Replacement Considerations

Consult official Microchip resources for comparable parts. Cross-reference pinouts and electrical characteristics carefully when substituting.